Have 2,500 miles on my 400. I drive with a fairly light foot and have no trouble getting 32/33 mpg on long trips. But most of my driving is city rush hour traffic and quite frankly even with gentle acceleration etc, I am struggling to get 21 mpg
Thanks for your narrative.
Following inspection of the subject matter, the matter has been accepted by the dealership as stated and work (replacement) carried out under warranty.
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Nice one, well done mate!